Here is the reproduction procedure:

1. Create a new calendar called "test" with the admin user account.
2. Log in with another user account called "localuser" and add the calender "test" in his watch list.
3. Log in with the admin user account again, then change the calendar name from "test" to "changename".
4. Log in with user account "localuser" again, then display the calendar, we can see that the calendar name is still "test" instead of "changename", but the data is still the same.

It looks like a name display issue.